android studio 更新ui的四种方式 handler_getactivity().runonuithread 更新ui

更新ui的四种方式：getactivity.runonuithread;handler.post;handler.sendmessage;view post

handler.post:

public class Main3Activity extends AppCompatActivity {
    TextView textView;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        textView=(TextView)findViewById(R.id.text3);
        new Thread(){
            @Override
            public void run() {
                super.run();
                try {
                    Thread.sleep(1000);
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            textView.setText("ok");
                        }
                    });
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
}

handler.sendmessage:

public class Main3Activity extends AppCompatActivity {
    TextView textView;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            textView.setText("ok 2");
        }
    };
    public void handler2(){
        handler.sendEmptyMessage(1);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        textView=(TextView)findViewById(R.id.text3);
        new Thread(){
            @Override
            public void run() {
                super.run();
                try {
                    Thread.sleep(1000);
                    handler2();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
   
}

public class Main3Activity extends AppCompatActivity {
    TextView textView;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

        }
    };
    private void updateUI(){
        runOnUiThread(new Runnable() {
            @Override
            public void run() {

            }
        });
    }
    public void handler2(){
        handler.sendEmptyMessage(1);
    }
    private void viewUI(){
        textView.post(new Runnable() {
            @Override
            public void run() {
                textView.setText("ok 2");
            }
        });
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        textView=(TextView)findViewById(R.id.text3);
        new Thread(){
            @Override
            public void run() {
                super.run();
                try {
                    Thread.sleep(1000);
                    viewUI();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
    public void handler1(){
        handler.post(new Runnable() {
            @Override
            public void run() {
                textView.setText("ok");
            }
        });
    }
}